Cars Information". Archived from the original on Retrieved British Foreign and Commonwealth Office. 185 186 The church has defined rules on who may be ordained into the clergy. "dogmatic constitution ON THE church lumen gentium ". 73 In the Latin Church, Catholic men may serve as deacons or priests by receiving sacramental ordination. "Catholic Church Issues Condemnation of Abortion, In-Vitro Fertilization". The Catholic Church holds that Christ instituted the papacy upon giving the keys of Heaven to Saint Peter.